Jig.



Patented July 7, 1914.

G. H. ELMORE @L 0. H. BOHM.

. JIG.

APPLIUATION FILED Nov. 11, 1912.

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THE NORRIS PETERS CO.. PHOTO-LITHO.. WASHINGTON. D. C

UNTER GUY H. ELMORE,

OF SWARTI-IMOR-E, PENNSYLVANIA, AND OSCAR H. BOI-IM, OF

BIRMINGHAM, ALABAMA.

JIG.

ideama.

Specification of Letters Patent.

Patented July 7, 1914.

Application filed November 11, 1912. Serial No. 730,674.

To all whom t may concern Be it known that we, GUY H. ELMORE, a citizenof the United States, and resident of Swarthmore, in the county ofDelaware and State of Pennsylvania, and @SGAR H. Borri/r, a citizen ofthe United States, and resident of Birmingham, in the county of Jedersonand State of Alabama, have invented certain new and useful Improvementsin Jigs, of which the following is a specification.

This invention relates vto jigs for separating and classifying mineralsubstances according t0 their specific gravities, and the principalfeatures of novelty reside in the discharge mechanism for the heaviersubstances forming the strata near the jig screen. In the case ofmetalliferous ores these strata are the concentrates, while in jigs usedfor washing coals these strata are the slate, bone and similar refuse.

vWhile capable of other use, our invention nds perhaps its greatestutility in jigs for washing coarse coals and the like.

The object of the present invention is to rovide a discharge mechanismfor jigs which will discharge the solid material but which will preventthe free outflow of water through the discharge.

The invention attains its greatest usefulness in discharging the coarserores and coal, the basic principle of the invention being the use of apocketed discharge valve having a restricted entrance aperture, whichoperates to prevent the complete lilling of the pockets of the valve,thus allowing the contained solid material to fall clear of the sealingface of the valve in order to prevent clogging. Other advantages of theinvention will be apparent to those skilled in the art.

The present improvements will now be described in connection with theaccompanying drawings, wherein Figure 1 is a vertical section throughthe discharge mechanism of a jig showing our improvements applied; Fig.2 is a section on the line lllll of Fig. 1; and Fig. 3 is a perspectiveview of the rotary valve member forming a part of the dischargemechanism.

We illustrate only the discharge mechanism which is capable ofapplication to a wide range of jigs and for example is readilyapplicable to a jig of the general type illustrated in Patent No.997,609, granted July 11, 1911 to Guy H. Elmore. j

In the drawings, 1 represents the walls of the jig tank which areextended at 2 to form an overhanging discharge pocket, closed along theend at 3 and open at the bottom at 4. Mounted in this overhangingportion is a metal tube 5, finished on its inner surface, and providedwith two opposite longitudinal ports or apertures 6 and 7 through whichthe discharged material is destined to pass. The ends of the tube 5 areclosed by two end pieces 8 and 9, which fit into the ends of the tube 5and are there held by the machine screws 10. rlhe end pieces 8 and 9 arerespectively provided with renewable bushings 11 and 12, the bushing 11having a through bearing, and the bushing 12 a socket bearing to supporta rotary valve later to be described. The tube 5, end pieces 8 and 9,and bushings 11 and 12 form what may be called the discharge valvecasing, and this is held in the over-hanging end of the jig-tank bybattens 13, 14 and 15, tight joints being made at all points by oakum orother packing 16. Consequently n0 flow can occur from the tank throughthe aperture 4 save through the ports 6' and 7.

Free flow through ports 6 and 7 is obstructed by means of a. pocketedrotary valve consisting of a hub portion 17 having radial vanes, asshown, to which are adjustably held by bolts 18 the feet or guard plates19, whichl are moved outward to compensate for wear. It is to be notedthat the space between any two radial vanes must register successivelyand never simultaneously with the apertures 6 and 7, and that the feetor guard plates 19 blank 0H a portion of said apertures. Consequentlythe rotary valve, by its close fit in the tube 5, precludes any freeoutflow of water from the jig, while the guard plates prevent theentrance of any particles large enough to clog the valve and prevent itsrotation. This last result arises partly from the fact of restriction ofthe entrance aperture and partly from the fact that the feet 19 becauseof their rearward projection with reference to the rotation of thevalve, preserve suiiicient unfilled space within the valve pocket toreceive the large particles until the valve pocket is fully open, sothat such particles readily enter. rThis feature of the addition ofrearwardly projecting feet makes possible the use in jigs for handlingcoarse material of a close fitting or sealing valve of the rotary type.The valve is rotated through the usual multiple pawls and ratchet 21,which latter is mounted on a stub shaft 22. This shaft 22 enters througha packing gland 23 and is provided with a squared end 24 engaging acorresponding socket 25 in the valve hub 17 (see Fi .2

The)heavy material to be discharged from the jig gradually passes fromthe jig screen 26, down an inclined sluice 27 to the valve. The lightermaterials flow off over the discharge plate 28, as is well understood inthe art. The line of demarcation between the strata passing out by theoverflow and those discharged by the valve may be determined by avertical adjustment of the plate 29 de pending from the inner side ofthe overflow 28. A secondary plate 80, which also is verticallyadjustable, prevents a too rapid low to the discharge valve; ordifferently stated, it causes the material to feed to the valve in athin layer rather than to form a -heavy bed over the valve which wouldcause clogging. Y In order to vent the air entering the j ig through thevalve, and otherwise trapped beneath the plate 28, we make use of a ventpipe 31 which may extend upward above the plate 28, as shown, thoughobviously other arrangements may be made.

From a consideration of the drawing the operation of the device willreadily be understood. The heavier material will flow down the inclinedplate 27, the depth of flow being determined by the adjustment ofcarrier 30. The inclination of the top surface of the material flowingbeyond plate 30 is largely dependent on the angle of repose of thematerial handled, and the plate is so adjusted that the material willflow into the pocket of the valve in a relatively thin layer. Therearwardly extending foot restricts the opening to this pocket in thevalve and by overhanging a portion of the pocket it prevents thecomplete lling there-of, by pre-y serving an unfilled space immediatelyunder the overhaging foot. Then as the valve continues to rotate and thepocket tends to move out of register with the entrance opening 6 in thevalve casing, the material falls away from the opening 6, so that thereis nothing to obstruct the rotation of the valve. Thus the free -actionof the valve is secured by the conjoint action of the barrier 80 and therotary valve with rearwardly extending feet. The specific proportionsand adjustment will vary somewhat according to the characteristics ofthe material handled.

Incidental advantages are the possibility of readily renewing worn partsand simplicity and cheapness of construction, but the possibility ofeliminating the watertight -boot heretofore generally used is thefeature of greatest value. l

Having thus described the invention, what we claim is 1. The combinationwith a jig including the usual tank, screen and overflow for the lightermaterials, of a discharge mechanism for the heavier materials comprisinga cylindrical valve chamber having lateral ports for the passage of suchmaterial; a vaned valve member, rotatably mounted in said chamber,adapted to make close contact with the inner walls thereof, and havingrearwardly extending guard plates at the vane extremities; and means forrotating the valve member.

2. The combination with a jig including the usual tank, screen andoverflow for the lighter materials, of a discharge mechanism for theheavier materials comprising a cylindrical valve chamber having lateralports for the passage of such material; a vaned valve member, rotatablymounted in said chamber, adapted to make close contact with the innerwalls thereof, and having rearwardly extending guard plates at thevaneextremities; a barrier plate adapted to re-` strict the depth of solidmaterial fiowing to said discharge mechanism; and means for rotatingsaid valve member.

3. The combination with a jig including a tank, screen, and overflow forthe lighter materials, heavier materials comprising a cylindrical valvechamber having lateral ports; a vaned valve member rotatably mounted insaid chamber; rearwardly extending guard plates radially adjustable onsaid vanes to make sealing contact with the walls of said chamber; andmeans for rotating the valve member.

4. The combination with a jig including a tank, screen, and overflow forthe lighter materials, of a discharge mechanism vfor the heaviermaterials comprising a. cylindrical valve chamber having lateral ports;a vaned valve member rotatably mounted in said chamber; rearwardlyextending guard plates radially adjustable on said vanes to make sealingcontact with the Walls of said chamber; a barrier plate to restrict thedepth of flowk of solid material Y mechanism; and means valve member.

5. The combination tank, screen,

for rotating the v with a jig including a and an overflow for thelighter materials, of a discharge mechanism for the heavier materialscomprising a cylindrical valve chamber having lateral ports; a pocketedvalve rotating therein, the openings to said pockets beingrestrictedinvarea` suiiciently to prevent complete filling of said pockets in thenormal operation of the valve; and means for rotating said valve.

6. The combination with a jig including a tank, screen, and an overflowfor the lighter materials, of a discharge mechanism for the heaviermaterials comprising a cylindrical valve chamber having lateral ports; apocketed valve rotating therein, the openings to of a dischargemechanism for the to said discharge j said pockets being restricted inarea suiiiciently to prevent complete tilling of said pockets in thenormal operation of the valve; a barrier to restrict the depth of solidmaterial flowing to said valve; and means for rotating said valve.

7 The combination with a jig including a tank, screen, and an overflowfor the lighter materials, of a discharge mechanism for the heaviermaterials comprising dividing means adapted to deiine the line ofdivision between the strata of lighter and heavier materials; aninclined sluice for the heavier material leading from said dividingmeans; a barrier mounted above said sluice beyond said dividing meansand adapted to restrict the depth of solid material owing down saidsluice; a pocketed valve adapted to receive material from said sluicebeyond said barrier and to discharge it from the jig; and means foroperating said valve.

8. The combination with a jig including a tank, screen and Overflow forthe lighter materials, of a discharge mechanism for the heaviermaterials, comprising a cylindrical valve chamber having lateral ports;a vaned valve member adapted to rotate in said chamber in sealingcontact with the walls thereof and having rearwardly extending guardplates adjacent the vane extremities; means for adjusting said valvemember to compensate for wear between it and said chamber; and means forrotating the valve member.

In testimony whereof we have signed our names to this speciiication eachin the presence of two subscribing witnesses.

GUY H. ELMORE.

Witnesses:

J. H. Pnnsoo'r'r, GUsrAvUs C. S. WELZEL.

OSCAR H. BOHM. Witnesses:

GEO. H. WEBB, W. V. TRAMMELL.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Bateau.

Washington, D. 0.

